weewx-Weather34 easyW34skinSetup runs Other PHP Run, index.php Does Not

[G Hammer]

Running Pop!_OS PHP 7.4.3 Apache 2.4 Python 3.8.2 setup.py method.

I have an identical test server and installed weewx and this template there a few days ago. Working well.

So, today I installed to my online server.

Does not run.

I have checked and double checked the install, the permissions, etc. I'm probably blind to whatever the issue is by now.

I can run any php from the folder the template is installed in, except for the index.php.

The easyW34skinSetup.php runs and writes the settings file.

WeeWX is creating the w34realtime.txt

I get 500 error when I try the site. weather.ghammer.net or weather.ghammer.net/index.php

Apache error logs show nothing.

Apache access logs only show that a 500 happened.

I have monitored the syslog with no hints.

I can use these URLs that are served from the same folder to get info on the system/software installed.

https://weather.ghammer.net/check-fetch-times.php

This one is very detailed on the entire apache and PHP environment.

https://weather.ghammer.net/php_test.php

https://weather.ghammer.net/test.php

Then there is the setup page. Of course, you don't have a password, but it shows that it works.

https://weather.ghammer.net/easyW34skinSetup.php

Any ideas?